Reduced Brake Power Message Displayed
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, 2004 Chevrolet Cab & Chassis Silverado, and 2003 GMC Sierra. However, it is still accessible from the selected car via links, so may be relevant.
Reduced Brake Power Message Displayed
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Brake Warning System Schematics | ||||
| 1 | Did you review the Brake Warning System Description and Operation and the Brake Assist System Description and Operation and perform the necessary inspections? | - | Go to Step 2 | Go to Symptoms - Hydraulic Brakes |
| 2 | Perform the Brake Assist System Diagnosis (Vacuum Assist) or Brake Assist System Diagnosis (Hydraulic Assist) . Did you find and correct the condition? |
- | Go to Step 8 | Go to Step 3 |
| 3 |
|
11 V | Go to Step 5 | Go to Step 4 |
| 4 |
|
- | Go to Step 8 | Go to Step 6 |
| 5 | With the SBA harness connector still disconnected, start the engine. Is the reduced brake power message displayed? |
- | Go to Step 6 | Go to Step 7 |
| 6 | Replace the instrument panel cluster. Refer to Instrument Panel Cluster (IPC) Replacement
in Instrument Panel, Gages, and Console. Did you complete the replacement? |
- | Go to Step 8 | - |
| 7 | Replace the supplemental brake assist pump motor assembly. Refer to Brake Assist Pump Motor Replacement . Did you complete the replacement? |
- | Go to Step 8 | - |
| 8 | Start the engine. Is the reduced brake power message displayed? |
- | Go to Step 2 | System OK |